Solution-Processed Nonvolatile Organic Transistor Memory Based on Semiconductor Blends.

Area of Science:

• Organic electronics
• Materials science
• Semiconductor devices

Background:

• Organic transistor memory devices rely on semiconductor properties for data storage.
• Electret properties significantly influence memory characteristics based on semiconductor energy levels.
• Charge trapping efficiency is key to device performance, determined by energy barriers.

Purpose of the Study:

• To fabricate solution-processed nonvolatile organic transistor memory devices using semiconductor blends.
• To investigate the impact of semiconductor blends on memory characteristics and performance.
• To achieve high memory ratios, wide memory windows, and long data retention.

Main Methods:

• Fabrication of organic transistor memory devices using blends of p-channel 6,13-bis(triisopropylsilylethynyl)pentacene and n-channel poly{[ N, N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]- alt-5,5'-(2,2'-bithiophene)} (P(NDI2OD-2T); N2200) on a polystyrene-brush electret.
• Optimization of semiconductor blending ratios for efficient programming and erasing.
• Characterization of memory characteristics, including ON/OFF current ratio and threshold voltage shifts.

Main Results:

• Achieved a high ON/OFF current ratio of approximately 10^7 and a memory window of 55 V.
• Demonstrated stable data retention for over 10 years with a memory ratio of 10^3.
• Observed preferable vertical phase separation in the semiconductor blend, ensuring reliability and ambient air stability.
• Single-component N2200 devices exhibited only writing-once-read-many (WORM)-type memory.

Conclusions:

• Optimized semiconductor blends significantly enhance organic transistor memory device performance.
• The developed memory devices offer high performance metrics and long-term stability.
• These devices show promise for versatile data storage in printed and flexible electronic applications.